158915551 has 4 divisors (see below), whose sum is σ = 159834312. Its totient is φ = 157996792.

The previous prime is 158915543. The next prime is 158915567. The reversal of 158915551 is 155519851.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 158915551 - 2³ = 158915543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158915501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459121 + ... + 459466.

It is an arithmetic number, because the mean of its divisors is an integer number (39958578).

Almost surely, 2^158915551 is an apocalyptic number.

158915551 is a deficient number, since it is larger than the sum of its proper divisors (918761).

158915551 is an equidigital number, since it uses as much as digits as its factorization.

158915551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918760.

The product of its digits is 45000, while the sum is 40.

The square root of 158915551 is about 12606.1711474976. The cubic root of 158915551 is about 541.6542220205.

The spelling of 158915551 in words is "one hundred fifty-eight million, nine hundred fifteen thousand, five hundred fifty-one".